diff --git a/BaseTools/Source/C/GenFv/GenFvInternalLib.c b/BaseTools/Source/C/GenFv/GenFvInternalLib.c
index 01c862e89a..2b80e7919b 100644
--- a/BaseTools/Source/C/GenFv/GenFvInternalLib.c
+++ b/BaseTools/Source/C/GenFv/GenFvInternalLib.c
@@ -44,6 +44,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 
 BOOLEAN mArm = FALSE;
 STATIC UINT32   MaxFfsAlignment = 0;
+BOOLEAN VtfFileFlag = FALSE;
 
 EFI_GUID  mEfiFirmwareVolumeTopFileGuid       = EFI_FFS_VOLUME_TOP_FILE_GUID;
 EFI_GUID  mFileGuidArray [MAX_NUMBER_OF_FILES_IN_FV];
@@ -600,7 +601,9 @@ Returns:
   UINTN               PadFileSize;
   UINT32              NextFfsHeaderSize;
   UINT32              CurFfsHeaderSize;
+  UINT32              Index;
 
+  Index = 0;
   CurFfsHeaderSize = sizeof (EFI_FFS_FILE_HEADER);
   //
   // Verify input parameters.
@@ -705,6 +708,19 @@ Returns:
     //
     // Copy Fv Extension Header and Set Fv Extension header offset
     //
+    if (ExtHeader->ExtHeaderSize > sizeof (EFI_FIRMWARE_VOLUME_EXT_HEADER)) {
+      for (Index = sizeof (EFI_FIRMWARE_VOLUME_EXT_HEADER); Index < ExtHeader->ExtHeaderSize;) {
+        if (((EFI_FIRMWARE_VOLUME_EXT_ENTRY *)((UINT8 *)ExtHeader + Index))-> ExtEntryType == EFI_FV_EXT_TYPE_USED_SIZE_TYPE) {
+          if (VtfFileFlag) {
+            ((EFI_FIRMWARE_VOLUME_EXT_ENTRY_USED_SIZE_TYPE *)((UINT8 *)ExtHeader + Index))->UsedSize = mFvTotalSize;
+          } else {
+            ((EFI_FIRMWARE_VOLUME_EXT_ENTRY_USED_SIZE_TYPE *)((UINT8 *)ExtHeader + Index))->UsedSize = mFvTakenSize;
+          }
+          break;
+        }
+        Index += ((EFI_FIRMWARE_VOLUME_EXT_ENTRY *)((UINT8 *)ExtHeader + Index))-> ExtEntrySize;
+      }
+    }
     memcpy ((UINT8 *)PadFile + CurFfsHeaderSize, ExtHeader, ExtHeader->ExtHeaderSize);
     ((EFI_FIRMWARE_VOLUME_HEADER *) FvImage->FileImage)->ExtHeaderOffset = (UINT16) ((UINTN) ((UINT8 *)PadFile + CurFfsHeaderSize) - (UINTN) FvImage->FileImage);
 	  //
@@ -3059,12 +3075,10 @@ Returns:
   UINT32              FfsAlignment;
   UINT32              FfsHeaderSize;
   EFI_FFS_FILE_HEADER FfsHeader;
-  BOOLEAN             VtfFileFlag;
   UINTN               VtfFileSize;
   
   FvExtendHeaderSize = 0;
   VtfFileSize = 0;
-  VtfFileFlag = FALSE;
   fpin  = NULL;
   Index = 0;
 
diff --git a/BaseTools/Source/C/Include/Common/PiFirmwareVolume.h b/BaseTools/Source/C/Include/Common/PiFirmwareVolume.h
index b5c2b03844..c3089e8b70 100644
--- a/BaseTools/Source/C/Include/Common/PiFirmwareVolume.h
+++ b/BaseTools/Source/C/Include/Common/PiFirmwareVolume.h
@@ -154,4 +154,10 @@ typedef struct {
   //
 } EFI_FIRMWARE_VOLUME_EXT_ENTRY_GUID_TYPE;
 
+#define EFI_FV_EXT_TYPE_USED_SIZE_TYPE 0x03
+typedef struct {
+  EFI_FIRMWARE_VOLUME_EXT_ENTRY Hdr;
+  UINT32 UsedSize;
+} EFI_FIRMWARE_VOLUME_EXT_ENTRY_USED_SIZE_TYPE;
+
 #endif
diff --git a/BaseTools/Source/Python/GenFds/FdfParser.py b/BaseTools/Source/Python/GenFds/FdfParser.py
index 499d0a6f05..b95afc7783 100644
--- a/BaseTools/Source/Python/GenFds/FdfParser.py
+++ b/BaseTools/Source/Python/GenFds/FdfParser.py
@@ -2311,7 +2311,7 @@ class FdfParser:
                            "WRITE_DISABLED_CAP", "WRITE_STATUS", "READ_ENABLED_CAP", \
                            "READ_DISABLED_CAP", "READ_STATUS", "READ_LOCK_CAP", \
                            "READ_LOCK_STATUS", "WRITE_LOCK_CAP", "WRITE_LOCK_STATUS", \
-                           "WRITE_POLICY_RELIABLE", "WEAK_ALIGNMENT"):
+                           "WRITE_POLICY_RELIABLE", "WEAK_ALIGNMENT", "FvUsedSizeEnable"):
                 self.__UndoToken()
                 return False
 
diff --git a/BaseTools/Source/Python/GenFds/Fv.py b/BaseTools/Source/Python/GenFds/Fv.py
index 4b03adc1c8..45f6696a5f 100644
--- a/BaseTools/Source/Python/GenFds/Fv.py
+++ b/BaseTools/Source/Python/GenFds/Fv.py
@@ -51,6 +51,7 @@ class FV (FvClassObject):
         self.FvBaseAddress = None
         self.FvForceRebase = None
         self.FvRegionInFD = None
+        self.UsedSizeEnable = False
         
     ## AddToBuffer()
     #
@@ -307,6 +308,10 @@ class FV (FvClassObject):
                                           T_CHAR_LF)
         if not (self.FvAttributeDict == None):
             for FvAttribute in self.FvAttributeDict.keys() :
+                if FvAttribute == "FvUsedSizeEnable":
+                    if self.FvAttributeDict[FvAttribute].upper() in ('TRUE', '1') :
+                        self.UsedSizeEnable = True
+                    continue
                 self.FvInfFile.writelines("EFI_"            + \
                                           FvAttribute       + \
                                           ' = '             + \
@@ -322,12 +327,22 @@ class FV (FvClassObject):
         # Generate FV extension header file
         #
         if self.FvNameGuid == None or self.FvNameGuid == '':
-            if len(self.FvExtEntryType) > 0:
+            if len(self.FvExtEntryType) > 0 or self.UsedSizeEnable:
                 GenFdsGlobalVariable.ErrorLogger("FV Extension Header Entries declared for %s with no FvNameGuid declaration." % (self.UiFvName))
         
         if self.FvNameGuid <> None and self.FvNameGuid <> '':
             TotalSize = 16 + 4
             Buffer = ''
+            if self.UsedSizeEnable:
+                TotalSize += (4 + 4)
+                ## define EFI_FV_EXT_TYPE_USED_SIZE_TYPE 0x03
+                #typedef  struct
+                # {
+                #    EFI_FIRMWARE_VOLUME_EXT_ENTRY Hdr;
+                #    UINT32 UsedSize;
+                # } EFI_FIRMWARE_VOLUME_EXT_ENTRY_USED_SIZE_TYPE;
+                Buffer += pack('HHL', 8, 3, 0)
+
             if self.FvNameString == 'TRUE':
                 #
                 # Create EXT entry for FV UI name